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      <i class="fa fa-calendar"></i>2016-07-31
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  <h1 class="passage-title">
    HTML的相关概念介绍
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    <h2 id="HTML"><a href="#HTML" class="headerlink" title="HTML"></a>HTML</h2><blockquote>
<p>超文本标记语言(简称：HTML)是一种用于创建网页的标准标记语言</p>
</blockquote>
<p>html编辑的页面在浏览器上运行，以.html或.htm结尾，是网页内容的载体</p>
<h3 id="HTML元素"><a href="#HTML元素" class="headerlink" title="HTML元素"></a>HTML元素</h3><blockquote>
<p>大多数 HTML 元素被定义为块级元素或行内元素。<strong>块级元素在浏览器显示时，通常会以新行来开始（和结束）</strong>。块级元素有 h1-h6，div，p，ul等，行内元素有a，br，b，en，i，span等，img和input则属于行内置换元素。<strong>置换元素在浏览器中会根据元素的标签和属性，来决定元素的具体显示内容</strong>想图片会根据src来显示图片信息，如不设置宽高，会按其内置宽高显示</p>
</blockquote>
<h3 id="文本格式"><a href="#文本格式" class="headerlink" title="文本格式"></a>文本格式</h3><blockquote>
<p>在HTML中有着格式化标签，其中包括： 字体加粗 <code>&lt;b&gt;加粗&lt;/b&gt;</code> ； 字体倾斜 <code>&lt;i&gt;倾斜&lt;/i&gt;</code> ； 文字下标 <code>&lt;sub&gt;下标&lt;/sub&gt;</code> ； 文字上标 <code>&lt;sup&gt;下标&lt;/sup&gt;</code> ； 语气强调 <code>&lt;strong&gt;强调：字体表现加粗&lt;/strong&gt;</code>； 轻度强调 <code>&lt;em&gt;强调：字体表现倾斜&lt;/em&gt;</code> ； 键盘文本 <code>&lt;kbd&gt; ctrl &lt;/kbd&gt;</code> ； 计算机代码 <code>&lt;code&gt; console&lt;/code&gt;</code> ； 预格式文本 <code>&lt;pre&gt; 有几个空格，就空几个 &lt;/pre&gt;</code> </p>
</blockquote>
<h3 id="标签语义化"><a href="#标签语义化" class="headerlink" title="标签语义化"></a>标签语义化</h3><blockquote>
<p>根据内容和结构选择合适的标签，便于开发者阅读同时对搜索引擎友好让机器很好的解析，例如根据 头部标签选择 <code>header</code> 标签，根据内容段落选择 <code>article</code> 和 <code>p</code>，根据表单输入选择 <code>aside</code> 和 <code>input</code> 等。这样文档结构定义明确便于后期维护。html5新增加的语义元素有：<code>header</code>（定义头部）；<code>nav</code>（定义导航链接）；<code>footer</code>（定义页尾）；<code>section</code>（定位文档中的节，页眉，页脚）<code>article</code>（定义独立内容：文章，评论）；<code>aside</code>（定义所处内容之外的内容）；<code>figure</code>（定义独立的流内容，照片，图表）</p>
</blockquote>
<h3 id="字符实体"><a href="#字符实体" class="headerlink" title="字符实体"></a>字符实体</h3><blockquote>
<p>在 HTML 中，某些字符是预留的，不允许在文本中使用，其中有<br>【空格 <code>&amp;nbsp;</code>】【&lt; <code>&amp;lt;</code>】 【&gt; <code>&amp;gt;</code>】【&amp; <code>&amp;amp;</code>】【￥ <code>&amp;yen;</code>】【&copy; <code>&amp;copy;</code>】【&reg; <code>&amp;reg;</code>】</p>
</blockquote>
<h3 id="web存储"><a href="#web存储" class="headerlink" title="web存储"></a>web存储</h3><blockquote>
<p>HTML5 提供了两种在客户端存储数据的新方法： 【<strong>localStorage</strong> - 没有时间限制的数据存储；】【sessionStorage -当用户关闭浏览器窗口后，数据会被删除】。两者有大小限制，一般为5Mb；</p>
</blockquote>
<h3 id="web-worker"><a href="#web-worker" class="headerlink" title="web worker"></a>web worker</h3><blockquote>
<p>web worker 是运行在后台的 JavaScript，不会影响页面的性能。当在 HTML 页面中执行脚本时，页面的状态是不可响应的，直到脚本已完成。web worker 运行于后台，可以在页面执行脚本时，仍然执行其他，如点击，选取等 【兼容性：IE不支持】</p>
</blockquote>
<h2 id="HTML5"><a href="#HTML5" class="headerlink" title="HTML5"></a>HTML5</h2><p>###HTML5兼容性</p>
<blockquote>
<p><strong>浏览器支持</strong> : 一般支持现代浏览器，如果要向以前兼容，则需要设定样式，所有浏览器，包括旧的和最新的，对无法识别的元素会作为内联元素自动处理，所以需要将其设定为块级元素 <code>header, section, footer, aside, nav, article,figure &#123; display: block; &#125;</code>但是ie8或更早的版本，可能不适应，所以要兼容ie9以上，则需要添加 <code>html5shiv.js</code> </p>
</blockquote>
<pre><code>&lt;!--[if lt IE 9]&gt;
    &lt;script src=&quot;http://cdn.static.runoob.com/libs/html5shiv/3.7/html5shiv.min.js&quot;&gt;&lt;/script&gt;（国内镜像）
&lt;![endif]--&gt;
</code></pre>
<h3 id="canvas-画布"><a href="#canvas-画布" class="headerlink" title="canvas 画布"></a>canvas 画布</h3><blockquote>
<p>canvas元素用于图形绘制，通过JavaScript脚本来进行绘制</p>
</blockquote>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">&lt;!-- 在HTML中创建canvas 元素 --&gt;</span><br><span class="line">&lt;canvas id=&quot;myCanvas&quot; width=&quot;200&quot; height=&quot;100&quot; style=&quot;border:1px solid #000000;&quot;&gt;&lt;/canvas&gt;</span><br></pre></td></tr></table></figure>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">// 通过JS语法绘制图形</span><br><span class="line">var c=document.getElementById(&quot;myCanvas&quot;);//找到canvas元素</span><br><span class="line">var ctx=c.getContext(&quot;2d&quot;);//创建了context对象</span><br><span class="line">//绘制红色矩形</span><br><span class="line">ctx.fillStyle=&quot;#FF0000&quot;;</span><br><span class="line">ctx.fillRect(0,0,150,75);</span><br></pre></td></tr></table></figure>

<p>###SVG 可伸缩矢量图形</p>
<blockquote>
<p>SVG 基于 XML，进行图形绘制。这意味着 SVG DOM 中的每个元素都是可用的。您可以为某个元素附加 JavaScript 事件处理器</p>
</blockquote>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">SVG 与 Canvas两者间的区别</span><br><span class="line"></span><br><span class="line">1：SVG 是一种使用 XML 描述 2D 图形的语言。</span><br><span class="line">2：Canvas 通过 JavaScript 来绘制 2D 图形。</span><br><span class="line"></span><br><span class="line">1：在 SVG 中，每个被绘制的图形均被视为对象。如果 SVG 对象的属性发生变化，那么浏览器能够自动重现图形。</span><br><span class="line">2：Canvas 是逐像素进行渲染的。在canvas中，一旦图形被绘制完成，它就不会继续得到浏览器的关注。如果其位置发生变化，那么整个场景也需要重新绘制，包括任何或许已被图形覆盖的对象</span><br></pre></td></tr></table></figure>
<p>###MathML</p>
<pre><code>HTML5 可以在文档中使用 MathML 元素，对应的标签是 &lt;math&gt;...&lt;/math&gt; 
MathML 是数学标记语言，是一种基于XML（标准通用标记语言的子集）的标准，用来在互联网上书写数学符号和公式的置标语言
</code></pre>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;</span><br><span class="line">    &lt;mrow&gt;</span><br><span class="line">        &lt;msup&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;</span><br><span class="line">        &lt;mo&gt;+&lt;/mo&gt;</span><br><span class="line">        &lt;msup&gt;&lt;mi&gt;b&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;</span><br><span class="line">        &lt;mo&gt;=&lt;/mo&gt;</span><br><span class="line">        &lt;msup&gt;&lt;mi&gt;c&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;</span><br><span class="line">    &lt;/mrow&gt;</span><br><span class="line">&lt;/math&gt;</span><br></pre></td></tr></table></figure>


<h3 id="拖放功能"><a href="#拖放功能" class="headerlink" title="拖放功能"></a>拖放功能</h3><blockquote>
<p>在HTML5中，拖放作为一种常见特性，任何元素都能拖放， 兼容性：<strong>IE 9+</strong></p>
</blockquote>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">&lt;div id=&quot;div1&quot; ondrop=&quot;drop(event)&quot; ondragover=&quot;allowDrop(event)&quot;&gt;&lt;/div&gt;</span><br><span class="line">&lt;img id=&quot;drag1&quot; src=&quot;img_logo.gif&quot; draggable=&quot;true&quot; ondragstart=&quot;drag(event)&quot; width=&quot;336&quot; height=&quot;69&quot; /&gt;</span><br></pre></td></tr></table></figure>

<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">function allowDrop(ev)&#123; ev.preventDefault(); &#125;</span><br><span class="line"></span><br><span class="line">function drag(ev)&#123; ev.dataTransfer.setData(&quot;Text&quot;,ev.target.id); &#125;</span><br><span class="line"></span><br><span class="line">function drop(ev)&#123;</span><br><span class="line">    ev.preventDefault();</span><br><span class="line">    var data=ev.dataTransfer.getData(&quot;Text&quot;);</span><br><span class="line">    ev.target.appendChild(document.getElementById(data));</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="web应用缓存-离线"><a href="#web应用缓存-离线" class="headerlink" title="web应用缓存 离线"></a>web应用缓存 离线</h3><blockquote>
<p>HTML5 引入了应用程序缓存，这意味着web应用可以缓存，它的优势有：离线浏览 - 用户可在应用离线时使用它们，速度更快 - 已缓存资源加载得更快；减少服务器负载 - 浏览器将只从服务器下载更新过或更改过的资源。 兼容性：<strong>IE不支持</strong></p>
</blockquote>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;html manifest=&quot;demo.appcache&quot;&gt;  &lt;!-- 首先在html 声明manifest=&quot;demo.appcache&quot; --&gt;</span><br></pre></td></tr></table></figure>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">//在服务器端创建扩展名为 .appcache 的Manifest文件. 放入服务器根目录</span><br><span class="line">CACHE MANIFEST  //CACHE MANIFEST - 在此标题下列出的文件将在首次下载后进行缓存 </span><br><span class="line">/theme.css   </span><br><span class="line">/logo.gif</span><br><span class="line">/main.js</span><br><span class="line"></span><br><span class="line">NETWORK:        //NETWORK - 在此标题下列出的文件需要与服务器的连接，且不会被缓存</span><br><span class="line">login.asp</span><br><span class="line"></span><br><span class="line">FALLBACK:       //FALLBACK - 在此标题下列出的文件规定当页面无法访问时的回退页面（比如 404 页面）</span><br><span class="line">/html5/ /404.html</span><br><span class="line"></span><br></pre></td></tr></table></figure>
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    <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#HTML"><span class="toc-text">HTML</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#HTML%E5%85%83%E7%B4%A0"><span class="toc-text">HTML元素</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%96%87%E6%9C%AC%E6%A0%BC%E5%BC%8F"><span class="toc-text">文本格式</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%A0%87%E7%AD%BE%E8%AF%AD%E4%B9%89%E5%8C%96"><span class="toc-text">标签语义化</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%AD%97%E7%AC%A6%E5%AE%9E%E4%BD%93"><span class="toc-text">字符实体</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#web%E5%AD%98%E5%82%A8"><span class="toc-text">web存储</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#web-worker"><span class="toc-text">web worker</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#HTML5"><span class="toc-text">HTML5</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#canvas-%E7%94%BB%E5%B8%83"><span class="toc-text">canvas 画布</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%8B%96%E6%94%BE%E5%8A%9F%E8%83%BD"><span class="toc-text">拖放功能</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#web%E5%BA%94%E7%94%A8%E7%BC%93%E5%AD%98-%E7%A6%BB%E7%BA%BF"><span class="toc-text">web应用缓存 离线</span></a></li></ol></li></ol>
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